According to indictments released last week by Special Counsel Robert Mueller, Russian intelligence officers successfully breached voter registration databases during the 2016 election. This echoes the Senate Intelligence Committee’s findings in a preliminary report on Russian interference in the election, which stated that Russia was “in a position to, at a minimum, alter or delete voter registration data” for a small number of states. The fact that a hostile foreign power had this capability is chilling, as voter registration databases may be our election system’s greatest vulnerability.